Gage-glass packing.



. Patented Aug. 22, |899. E. L. PERRY,-JR.

GAGE GLAss PACKING.

(Applicalt'xoijx ld Apr. 13, 1899.)

A No. 631,651.

( NG Model.)

el Hoz u m ggg/w UNITED Y`@STATES I PATENT EEIc'E.

EDWARDL PERRT, JR., or PATTERSON, NEW JERSEY.

GAGE-GLASS PACKING.

SPECIFICATION forming part of Letters Patent No. 631,661, dated August22, 1899.

Y Application ledApril 13,1899. Serial No. 712,869. (No model T0 allwhom t may con/cern:

Be it known that I, EDWARD L. PERRY, Jr., a citizen of the UnitedStates, residing at Paterson, in the county of Passaic and State ofmaking a part of this specification, and to the the letters of referencemarked thereon.

The present invention has relation to certain new and usefulimprovements in the rubber or othei elastic packing used upon the endsof gage-glasses where they connect with the usual screw-cap andcoupling.

Previous to my invention the usual manner of packing glass water-gagesconsisted in a simple rubber or other elastic ring, and while thiscustom had been in use by engineers generally there have been manydevices offered for improvement on account of the great loss incident tothe breakage of the glass gagetube, which in most instances is dueeither to the careless manner in packing the glass tube by screwing upthe screw cap yor nut tightly or the glass being out of plumb, either ofwhich causes rendering the tube liable to break when under high pressureand heated to a high temperature.

My invention consists of an elastic packing preferably in form of a ringor washer and of such construction as will avoid the possibility ofbreakage'of the glass gage-tube, as will be hereinafter described andclaimed.

Figure 1 of the drawings is a sectional eleva- Ation of a gage-glasswith its screw cap or nut and coupling at its ends and showing myimproved packing applied thereto; Fig. 2, a sectional elevation of theelastic packing, on an enlarged scale, showing the expansionchambertherein; Fig. 3, a perspective view In the accompanying drawings, Arepresents the ordinary glass tube of a steamgage, and B the rubber orother elastic packing which is held between the screw cap or nut C andthe end of the coupling D, which screw cap or nut and coupling are ofordinary construction and connect with each other by screw-threadsthereon in the usual manner.

The packing B, which constitutes my i11- vention, is preferably in theform of a ring` or washer and is composed of rubber or other elasticmaterial with a circumferential extain requirements, and in order thatthe same' may pack both on the inner and outer sides at the proper pointit is necessary to have as .large a body of gum or elastic material fromwhich the packing is composed as possible, both on the inner side at thebottom and on the outer side at the top of said packing.

Therefore in order to secure this body of gum or elastic material atboth top and bottom on the outer and inner sides, respectively, thecircumferential eXpansion-chamberE is made of the same diameterthroughout its depth and extending on an incline in a direction towardthe central opening of the packing with which the chamber joins. Thisinclination of the expansion-chamber, as will be seen, leaves an excessof material at the outer end and side of the packing and at the innerend and inner side thereof.

The beveled edge F of the packing is also an important feature of theinvention, as the inner edge of this bevel is on a higher plane than theouter edge, thus forming a joint or connection with the metal coupling Dbefore the nut or cap C is tightened, thereby acting as a guide to leadthe water or steam into the expansion-chamber E and. preventing it fromescaping to the outer side of the packing, in which case the packingwould be prevented from performing its work properly. It will thereforebe seen that both the inclined expansion-chamber and the bevel upon thevouter edge of the packing are two essential features of the invention,and without them a packing would be useless when applied to agage-glass.

IOO

Vithout exerting an undue pressure on the end of the glass tube the nutor cap can be screwed down simply by the use of the foreinger and thumb,dispensing entirely with the use of a wrench, which in many cases is thecause of breakage and trouble, the glass tube when used in connectionwith my improved packing being capable of ready removal for the purposeof cleaning and returned to its place Without danger of breaking.

Having now fully described my invention, what I claim as new, and desireto secu re by Letters Patent, is

An elastic packing for gage-glasses, said packing consisting of a ringof elastic mate- EDVARD L. PERRY, JR.

Witnesses:

CHAs. B. WILLIAMS, FRANK G. LozIER.

